How could the heat ducts become clogged in a Falcon 50?

  The foam inside the ducts has deteriorated and fallen onto the outlet registers at the carpet level. loosefoamf50022heatduct     Foam released from some areas inside the ducts Dime size chunks completely covered some outlets Smaller pieces Bosrescope in duct   Possibly the situation was made worse because earlier in the year, the airplane … Continue reading How could the heat ducts become clogged in a Falcon 50?